Mercurial > hg
annotate mercurial/tags.py @ 47072:4c041c71ec01
revlog: introduce an explicit tracking of what the revlog is about
Since the dawn of time, people have been forced to rely to lossy introspection
of the index filename to determine what the purpose and role of the revlog they
encounter is. This is hacky, error prone, inflexible, abstraction-leaky,
<insert-your-own-complaints-here>.
In f63299ee7e4d Raphaël introduced a new attribute to track this information:
`revlog_kind`. However it is initialized in an odd place and various instances
end up not having it set. In addition is only tracking some of the information
we end up having to introspect in various pieces of code.
So we add a new attribute that holds more data and is more strictly enforced.
This work is done in collaboration with Raphaël.
The `revlog_kind` one will be removed/adapted in the next changeset. We expect
to be able to clean up various existing piece of code and to simplify coming
work around the newer revlog format.
Differential Revision: https://phab.mercurial-scm.org/D10352
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 06 Apr 2021 05:20:24 +0200 |
parents | d55b71393907 |
children | 6000f5b25c9b d4b66dc500c5 |
rev | line source |
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1 # tags.py - read tag info from local repository |
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2 # |
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3 # Copyright 2009 Olivia Mackall <olivia@selenic.com> |
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4 # Copyright 2009 Greg Ward <greg@gerg.ca> |
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5 # |
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6 # This software may be used and distributed according to the terms of the |
10263 | 7 # GNU General Public License version 2 or any later version. |
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8 |
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9 # Currently this module only deals with reading and caching tags. |
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10 # Eventually, it could take care of updating (adding/removing/moving) |
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11 # tags too. |
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12 |
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13 from __future__ import absolute_import |
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14 |
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15 import errno |
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16 import io |
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17 |
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18 from .node import ( |
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19 bin, |
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20 hex, |
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21 nullrev, |
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22 short, |
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23 ) |
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24 from .i18n import _ |
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25 from . import ( |
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26 encoding, |
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27 error, |
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28 match as matchmod, |
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29 pycompat, |
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30 scmutil, |
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31 util, |
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32 ) |
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33 from .utils import stringutil |
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34 |
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35 # Tags computation can be expensive and caches exist to make it fast in |
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36 # the common case. |
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37 # |
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38 # The "hgtagsfnodes1" cache file caches the .hgtags filenode values for |
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39 # each revision in the repository. The file is effectively an array of |
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40 # fixed length records. Read the docs for "hgtagsfnodescache" for technical |
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41 # details. |
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42 # |
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43 # The .hgtags filenode cache grows in proportion to the length of the |
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44 # changelog. The file is truncated when the # changelog is stripped. |
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45 # |
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46 # The purpose of the filenode cache is to avoid the most expensive part |
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47 # of finding global tags, which is looking up the .hgtags filenode in the |
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48 # manifest for each head. This can take dozens or over 100ms for |
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49 # repositories with very large manifests. Multiplied by dozens or even |
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50 # hundreds of heads and there is a significant performance concern. |
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51 # |
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52 # There also exist a separate cache file for each repository filter. |
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53 # These "tags-*" files store information about the history of tags. |
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54 # |
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55 # The tags cache files consists of a cache validation line followed by |
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56 # a history of tags. |
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57 # |
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58 # The cache validation line has the format: |
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59 # |
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60 # <tiprev> <tipnode> [<filteredhash>] |
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61 # |
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62 # <tiprev> is an integer revision and <tipnode> is a 40 character hex |
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63 # node for that changeset. These redundantly identify the repository |
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64 # tip from the time the cache was written. In addition, <filteredhash>, |
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65 # if present, is a 40 character hex hash of the contents of the filtered |
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66 # revisions for this filter. If the set of filtered revs changes, the |
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67 # hash will change and invalidate the cache. |
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68 # |
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69 # The history part of the tags cache consists of lines of the form: |
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70 # |
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71 # <node> <tag> |
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72 # |
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73 # (This format is identical to that of .hgtags files.) |
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74 # |
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75 # <tag> is the tag name and <node> is the 40 character hex changeset |
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76 # the tag is associated with. |
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77 # |
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78 # Tags are written sorted by tag name. |
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79 # |
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80 # Tags associated with multiple changesets have an entry for each changeset. |
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81 # The most recent changeset (in terms of revlog ordering for the head |
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82 # setting it) for each tag is last. |
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83 |
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84 |
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85 def fnoderevs(ui, repo, revs): |
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86 """return the list of '.hgtags' fnodes used in a set revisions |
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87 |
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88 This is returned as list of unique fnodes. We use a list instead of a set |
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89 because order matters when it comes to tags.""" |
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90 unfi = repo.unfiltered() |
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91 tonode = unfi.changelog.node |
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92 nodes = [tonode(r) for r in revs] |
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93 fnodes = _getfnodes(ui, repo, nodes) |
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94 fnodes = _filterfnodes(fnodes, nodes) |
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95 return fnodes |
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96 |
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97 |
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98 def _nulltonone(repo, value): |
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99 """convert nullid to None |
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100 |
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101 For tag value, nullid means "deleted". This small utility function helps |
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102 translating that to None.""" |
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103 if value == repo.nullid: |
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104 return None |
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105 return value |
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106 |
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107 |
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108 def difftags(ui, repo, oldfnodes, newfnodes): |
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109 """list differences between tags expressed in two set of file-nodes |
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110 |
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111 The list contains entries in the form: (tagname, oldvalue, new value). |
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112 None is used to expressed missing value: |
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113 ('foo', None, 'abcd') is a new tag, |
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114 ('bar', 'ef01', None) is a deletion, |
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115 ('baz', 'abcd', 'ef01') is a tag movement. |
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116 """ |
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117 if oldfnodes == newfnodes: |
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118 return [] |
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119 oldtags = _tagsfromfnodes(ui, repo, oldfnodes) |
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120 newtags = _tagsfromfnodes(ui, repo, newfnodes) |
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121 |
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122 # list of (tag, old, new): None means missing |
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123 entries = [] |
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124 for tag, (new, __) in newtags.items(): |
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125 new = _nulltonone(repo, new) |
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126 old, __ = oldtags.pop(tag, (None, None)) |
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127 old = _nulltonone(repo, old) |
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128 if old != new: |
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129 entries.append((tag, old, new)) |
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130 # handle deleted tags |
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131 for tag, (old, __) in oldtags.items(): |
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132 old = _nulltonone(repo, old) |
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133 if old is not None: |
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134 entries.append((tag, old, None)) |
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135 entries.sort() |
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136 return entries |
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137 |
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138 |
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139 def writediff(fp, difflist): |
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140 """write tags diff information to a file. |
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141 |
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142 Data are stored with a line based format: |
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143 |
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144 <action> <hex-node> <tag-name>\n |
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145 |
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146 Action are defined as follow: |
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147 -R tag is removed, |
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148 +A tag is added, |
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149 -M tag is moved (old value), |
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150 +M tag is moved (new value), |
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151 |
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152 Example: |
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153 |
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154 +A 875517b4806a848f942811a315a5bce30804ae85 t5 |
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155 |
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156 See documentation of difftags output for details about the input. |
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157 """ |
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158 add = b'+A %s %s\n' |
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159 remove = b'-R %s %s\n' |
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160 updateold = b'-M %s %s\n' |
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161 updatenew = b'+M %s %s\n' |
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162 for tag, old, new in difflist: |
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163 # translate to hex |
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164 if old is not None: |
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165 old = hex(old) |
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166 if new is not None: |
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167 new = hex(new) |
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168 # write to file |
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169 if old is None: |
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170 fp.write(add % (new, tag)) |
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171 elif new is None: |
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172 fp.write(remove % (old, tag)) |
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173 else: |
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174 fp.write(updateold % (old, tag)) |
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175 fp.write(updatenew % (new, tag)) |
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176 |
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177 |
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178 def findglobaltags(ui, repo): |
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179 """Find global tags in a repo: return a tagsmap |
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180 |
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181 tagsmap: tag name to (node, hist) 2-tuples. |
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182 |
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183 The tags cache is read and updated as a side-effect of calling. |
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184 """ |
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185 (heads, tagfnode, valid, cachetags, shouldwrite) = _readtagcache(ui, repo) |
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186 if cachetags is not None: |
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187 assert not shouldwrite |
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188 # XXX is this really 100% correct? are there oddball special |
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189 # cases where a global tag should outrank a local tag but won't, |
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190 # because cachetags does not contain rank info? |
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191 alltags = {} |
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192 _updatetags(cachetags, alltags) |
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193 return alltags |
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194 |
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195 for head in reversed(heads): # oldest to newest |
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196 assert repo.changelog.index.has_node( |
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197 head |
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198 ), b"tag cache returned bogus head %s" % short(head) |
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199 fnodes = _filterfnodes(tagfnode, reversed(heads)) |
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200 alltags = _tagsfromfnodes(ui, repo, fnodes) |
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201 |
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202 # and update the cache (if necessary) |
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203 if shouldwrite: |
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204 _writetagcache(ui, repo, valid, alltags) |
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205 return alltags |
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206 |
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207 |
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208 def _filterfnodes(tagfnode, nodes): |
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209 """return a list of unique fnodes |
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210 |
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211 The order of this list matches the order of "nodes". Preserving this order |
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212 is important as reading tags in different order provides different |
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213 results.""" |
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214 seen = set() # set of fnode |
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215 fnodes = [] |
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216 for no in nodes: # oldest to newest |
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217 fnode = tagfnode.get(no) |
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218 if fnode and fnode not in seen: |
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219 seen.add(fnode) |
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220 fnodes.append(fnode) |
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221 return fnodes |
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222 |
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223 |
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224 def _tagsfromfnodes(ui, repo, fnodes): |
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225 """return a tagsmap from a list of file-node |
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226 |
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227 tagsmap: tag name to (node, hist) 2-tuples. |
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228 |
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229 The order of the list matters.""" |
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230 alltags = {} |
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231 fctx = None |
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232 for fnode in fnodes: |
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233 if fctx is None: |
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234 fctx = repo.filectx(b'.hgtags', fileid=fnode) |
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235 else: |
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236 fctx = fctx.filectx(fnode) |
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237 filetags = _readtags(ui, repo, fctx.data().splitlines(), fctx) |
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238 _updatetags(filetags, alltags) |
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239 return alltags |
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240 |
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241 |
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242 def readlocaltags(ui, repo, alltags, tagtypes): |
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243 '''Read local tags in repo. Update alltags and tagtypes.''' |
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244 try: |
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245 data = repo.vfs.read(b"localtags") |
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246 except IOError as inst: |
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247 if inst.errno != errno.ENOENT: |
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248 raise |
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249 return |
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250 |
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251 # localtags is in the local encoding; re-encode to UTF-8 on |
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252 # input for consistency with the rest of this module. |
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253 filetags = _readtags( |
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254 ui, repo, data.splitlines(), b"localtags", recode=encoding.fromlocal |
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255 ) |
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256 |
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257 # remove tags pointing to invalid nodes |
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258 cl = repo.changelog |
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259 for t in list(filetags): |
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260 try: |
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261 cl.rev(filetags[t][0]) |
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262 except (LookupError, ValueError): |
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263 del filetags[t] |
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264 |
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265 _updatetags(filetags, alltags, b'local', tagtypes) |
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266 |
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267 |
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268 def _readtaghist(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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269 """Read tag definitions from a file (or any source of lines). |
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270 |
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271 This function returns two sortdicts with similar information: |
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272 |
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273 - the first dict, bintaghist, contains the tag information as expected by |
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274 the _readtags function, i.e. a mapping from tag name to (node, hist): |
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275 - node is the node id from the last line read for that name, |
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276 - hist is the list of node ids previously associated with it (in file |
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277 order). All node ids are binary, not hex. |
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278 |
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279 - the second dict, hextaglines, is a mapping from tag name to a list of |
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280 [hexnode, line number] pairs, ordered from the oldest to the newest node. |
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281 |
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282 When calcnodelines is False the hextaglines dict is not calculated (an |
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283 empty dict is returned). This is done to improve this function's |
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284 performance in cases where the line numbers are not needed. |
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285 """ |
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286 |
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287 bintaghist = util.sortdict() |
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288 hextaglines = util.sortdict() |
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289 count = 0 |
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290 |
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291 def dbg(msg): |
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292 ui.debug(b"%s, line %d: %s\n" % (fn, count, msg)) |
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293 |
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294 for nline, line in enumerate(lines): |
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295 count += 1 |
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296 if not line: |
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297 continue |
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298 try: |
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299 (nodehex, name) = line.split(b" ", 1) |
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300 except ValueError: |
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301 dbg(b"cannot parse entry") |
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302 continue |
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303 name = name.strip() |
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304 if recode: |
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305 name = recode(name) |
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306 try: |
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307 nodebin = bin(nodehex) |
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308 except TypeError: |
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309 dbg(b"node '%s' is not well formed" % nodehex) |
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310 continue |
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311 |
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312 # update filetags |
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313 if calcnodelines: |
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314 # map tag name to a list of line numbers |
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315 if name not in hextaglines: |
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316 hextaglines[name] = [] |
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317 hextaglines[name].append([nodehex, nline]) |
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318 continue |
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319 # map tag name to (node, hist) |
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320 if name not in bintaghist: |
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321 bintaghist[name] = [] |
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322 bintaghist[name].append(nodebin) |
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323 return bintaghist, hextaglines |
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324 |
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325 |
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326 def _readtags(ui, repo, lines, fn, recode=None, calcnodelines=False): |
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327 """Read tag definitions from a file (or any source of lines). |
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328 |
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329 Returns a mapping from tag name to (node, hist). |
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330 |
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331 "node" is the node id from the last line read for that name. "hist" |
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332 is the list of node ids previously associated with it (in file order). |
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333 All node ids are binary, not hex. |
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334 """ |
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335 filetags, nodelines = _readtaghist( |
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336 ui, repo, lines, fn, recode=recode, calcnodelines=calcnodelines |
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337 ) |
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338 # util.sortdict().__setitem__ is much slower at replacing then inserting |
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339 # new entries. The difference can matter if there are thousands of tags. |
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340 # Create a new sortdict to avoid the performance penalty. |
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341 newtags = util.sortdict() |
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342 for tag, taghist in filetags.items(): |
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343 newtags[tag] = (taghist[-1], taghist[:-1]) |
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344 return newtags |
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345 |
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346 |
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347 def _updatetags(filetags, alltags, tagtype=None, tagtypes=None): |
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348 """Incorporate the tag info read from one file into dictionnaries |
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349 |
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350 The first one, 'alltags', is a "tagmaps" (see 'findglobaltags' for details). |
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351 |
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352 The second one, 'tagtypes', is optional and will be updated to track the |
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353 "tagtype" of entries in the tagmaps. When set, the 'tagtype' argument also |
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354 needs to be set.""" |
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355 if tagtype is None: |
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356 assert tagtypes is None |
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357 |
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358 for name, nodehist in pycompat.iteritems(filetags): |
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359 if name not in alltags: |
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360 alltags[name] = nodehist |
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361 if tagtype is not None: |
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362 tagtypes[name] = tagtype |
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363 continue |
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364 |
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365 # we prefer alltags[name] if: |
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366 # it supersedes us OR |
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367 # mutual supersedes and it has a higher rank |
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368 # otherwise we win because we're tip-most |
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369 anode, ahist = nodehist |
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370 bnode, bhist = alltags[name] |
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371 if ( |
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372 bnode != anode |
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373 and anode in bhist |
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374 and (bnode not in ahist or len(bhist) > len(ahist)) |
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375 ): |
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376 anode = bnode |
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377 elif tagtype is not None: |
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378 tagtypes[name] = tagtype |
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379 ahist.extend([n for n in bhist if n not in ahist]) |
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380 alltags[name] = anode, ahist |
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381 |
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382 |
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383 def _filename(repo): |
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384 """name of a tagcache file for a given repo or repoview""" |
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385 filename = b'tags2' |
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386 if repo.filtername: |
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387 filename = b'%s-%s' % (filename, repo.filtername) |
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388 return filename |
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389 |
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390 |
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391 def _readtagcache(ui, repo): |
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392 """Read the tag cache. |
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393 |
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394 Returns a tuple (heads, fnodes, validinfo, cachetags, shouldwrite). |
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395 |
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396 If the cache is completely up-to-date, "cachetags" is a dict of the |
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397 form returned by _readtags() and "heads", "fnodes", and "validinfo" are |
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398 None and "shouldwrite" is False. |
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399 |
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400 If the cache is not up to date, "cachetags" is None. "heads" is a list |
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401 of all heads currently in the repository, ordered from tip to oldest. |
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402 "validinfo" is a tuple describing cache validation info. This is used |
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403 when writing the tags cache. "fnodes" is a mapping from head to .hgtags |
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404 filenode. "shouldwrite" is True. |
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405 |
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406 If the cache is not up to date, the caller is responsible for reading tag |
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407 info from each returned head. (See findglobaltags().) |
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408 """ |
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409 try: |
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410 cachefile = repo.cachevfs(_filename(repo), b'r') |
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411 # force reading the file for static-http |
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412 cachelines = iter(cachefile) |
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413 except IOError: |
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414 cachefile = None |
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415 |
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416 cacherev = None |
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417 cachenode = None |
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418 cachehash = None |
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419 if cachefile: |
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420 try: |
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421 validline = next(cachelines) |
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422 validline = validline.split() |
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423 cacherev = int(validline[0]) |
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424 cachenode = bin(validline[1]) |
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425 if len(validline) > 2: |
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426 cachehash = bin(validline[2]) |
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427 except Exception: |
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428 # corruption of the cache, just recompute it. |
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429 pass |
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430 |
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431 tipnode = repo.changelog.tip() |
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432 tiprev = len(repo.changelog) - 1 |
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433 |
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434 # Case 1 (common): tip is the same, so nothing has changed. |
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435 # (Unchanged tip trivially means no changesets have been added. |
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436 # But, thanks to localrepository.destroyed(), it also means none |
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437 # have been destroyed by strip or rollback.) |
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438 if ( |
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439 cacherev == tiprev |
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440 and cachenode == tipnode |
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441 and cachehash == scmutil.filteredhash(repo, tiprev) |
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442 ): |
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443 tags = _readtags(ui, repo, cachelines, cachefile.name) |
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444 cachefile.close() |
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445 return (None, None, None, tags, False) |
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446 if cachefile: |
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447 cachefile.close() # ignore rest of file |
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448 |
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449 valid = (tiprev, tipnode, scmutil.filteredhash(repo, tiprev)) |
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450 |
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451 repoheads = repo.heads() |
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452 # Case 2 (uncommon): empty repo; get out quickly and don't bother |
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453 # writing an empty cache. |
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454 if repoheads == [repo.nullid]: |
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455 return ([], {}, valid, {}, False) |
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456 |
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457 # Case 3 (uncommon): cache file missing or empty. |
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458 |
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459 # Case 4 (uncommon): tip rev decreased. This should only happen |
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460 # when we're called from localrepository.destroyed(). Refresh the |
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461 # cache so future invocations will not see disappeared heads in the |
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462 # cache. |
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463 |
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464 # Case 5 (common): tip has changed, so we've added/replaced heads. |
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465 |
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466 # As it happens, the code to handle cases 3, 4, 5 is the same. |
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467 |
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468 # N.B. in case 4 (nodes destroyed), "new head" really means "newly |
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469 # exposed". |
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470 if not len(repo.file(b'.hgtags')): |
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471 # No tags have ever been committed, so we can avoid a |
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472 # potentially expensive search. |
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473 return ([], {}, valid, None, True) |
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474 |
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475 # Now we have to lookup the .hgtags filenode for every new head. |
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476 # This is the most expensive part of finding tags, so performance |
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477 # depends primarily on the size of newheads. Worst case: no cache |
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478 # file, so newheads == repoheads. |
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479 # Reversed order helps the cache ('repoheads' is in descending order) |
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480 cachefnode = _getfnodes(ui, repo, reversed(repoheads)) |
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481 |
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482 # Caller has to iterate over all heads, but can use the filenodes in |
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483 # cachefnode to get to each .hgtags revision quickly. |
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484 return (repoheads, cachefnode, valid, None, True) |
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485 |
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486 |
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487 def _getfnodes(ui, repo, nodes): |
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488 """return .hgtags fnodes for a list of changeset nodes |
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489 |
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490 Return value is a {node: fnode} mapping. There will be no entry for nodes |
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491 without a '.hgtags' file. |
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492 """ |
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493 starttime = util.timer() |
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494 fnodescache = hgtagsfnodescache(repo.unfiltered()) |
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495 cachefnode = {} |
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496 validated_fnodes = set() |
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497 unknown_entries = set() |
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498 for node in nodes: |
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499 fnode = fnodescache.getfnode(node) |
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500 flog = repo.file(b'.hgtags') |
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501 if fnode != repo.nullid: |
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502 if fnode not in validated_fnodes: |
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503 if flog.hasnode(fnode): |
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504 validated_fnodes.add(fnode) |
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505 else: |
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506 unknown_entries.add(node) |
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507 cachefnode[node] = fnode |
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508 |
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509 if unknown_entries: |
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510 fixed_nodemap = fnodescache.refresh_invalid_nodes(unknown_entries) |
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511 for node, fnode in pycompat.iteritems(fixed_nodemap): |
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512 if fnode != repo.nullid: |
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513 cachefnode[node] = fnode |
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514 |
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515 fnodescache.write() |
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516 |
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517 duration = util.timer() - starttime |
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518 ui.log( |
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519 b'tagscache', |
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520 b'%d/%d cache hits/lookups in %0.4f seconds\n', |
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521 fnodescache.hitcount, |
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522 fnodescache.lookupcount, |
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523 duration, |
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524 ) |
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525 return cachefnode |
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526 |
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527 |
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528 def _writetagcache(ui, repo, valid, cachetags): |
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529 filename = _filename(repo) |
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530 try: |
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531 cachefile = repo.cachevfs(filename, b'w', atomictemp=True) |
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532 except (OSError, IOError): |
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533 return |
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534 |
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535 ui.log( |
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536 b'tagscache', |
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537 b'writing .hg/cache/%s with %d tags\n', |
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538 filename, |
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539 len(cachetags), |
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540 ) |
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541 |
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542 if valid[2]: |
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543 cachefile.write( |
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544 b'%d %s %s\n' % (valid[0], hex(valid[1]), hex(valid[2])) |
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545 ) |
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546 else: |
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547 cachefile.write(b'%d %s\n' % (valid[0], hex(valid[1]))) |
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548 |
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549 # Tag names in the cache are in UTF-8 -- which is the whole reason |
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550 # we keep them in UTF-8 throughout this module. If we converted |
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551 # them local encoding on input, we would lose info writing them to |
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552 # the cache. |
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553 for (name, (node, hist)) in sorted(pycompat.iteritems(cachetags)): |
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554 for n in hist: |
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555 cachefile.write(b"%s %s\n" % (hex(n), name)) |
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556 cachefile.write(b"%s %s\n" % (hex(node), name)) |
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557 |
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558 try: |
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559 cachefile.close() |
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560 except (OSError, IOError): |
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561 pass |
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562 |
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563 |
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564 def tag(repo, names, node, message, local, user, date, editor=False): |
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565 """tag a revision with one or more symbolic names. |
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566 |
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567 names is a list of strings or, when adding a single tag, names may be a |
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568 string. |
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569 |
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570 if local is True, the tags are stored in a per-repository file. |
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571 otherwise, they are stored in the .hgtags file, and a new |
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572 changeset is committed with the change. |
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573 |
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574 keyword arguments: |
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575 |
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576 local: whether to store tags in non-version-controlled file |
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577 (default False) |
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578 |
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579 message: commit message to use if committing |
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580 |
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581 user: name of user to use if committing |
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582 |
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583 date: date tuple to use if committing""" |
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584 |
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585 if not local: |
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586 m = matchmod.exact([b'.hgtags']) |
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587 st = repo.status(match=m, unknown=True, ignored=True) |
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588 if any( |
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589 ( |
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590 st.modified, |
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591 st.added, |
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592 st.removed, |
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593 st.deleted, |
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594 st.unknown, |
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595 st.ignored, |
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596 ) |
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597 ): |
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598 raise error.Abort( |
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599 _(b'working copy of .hgtags is changed'), |
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600 hint=_(b'please commit .hgtags manually'), |
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601 ) |
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602 |
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603 with repo.wlock(): |
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604 repo.tags() # instantiate the cache |
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605 _tag(repo, names, node, message, local, user, date, editor=editor) |
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606 |
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607 |
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608 def _tag( |
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609 repo, names, node, message, local, user, date, extra=None, editor=False |
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610 ): |
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611 if isinstance(names, bytes): |
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612 names = (names,) |
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613 |
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614 branches = repo.branchmap() |
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615 for name in names: |
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616 repo.hook(b'pretag', throw=True, node=hex(node), tag=name, local=local) |
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617 if name in branches: |
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618 repo.ui.warn( |
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619 _(b"warning: tag %s conflicts with existing branch name\n") |
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620 % name |
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621 ) |
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622 |
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623 def writetags(fp, names, munge, prevtags): |
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624 fp.seek(0, io.SEEK_END) |
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625 if prevtags and not prevtags.endswith(b'\n'): |
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626 fp.write(b'\n') |
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627 for name in names: |
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628 if munge: |
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629 m = munge(name) |
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630 else: |
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631 m = name |
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632 |
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633 if repo._tagscache.tagtypes and name in repo._tagscache.tagtypes: |
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634 old = repo.tags().get(name, repo.nullid) |
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635 fp.write(b'%s %s\n' % (hex(old), m)) |
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636 fp.write(b'%s %s\n' % (hex(node), m)) |
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637 fp.close() |
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638 |
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639 prevtags = b'' |
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640 if local: |
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641 try: |
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642 fp = repo.vfs(b'localtags', b'r+') |
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643 except IOError: |
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644 fp = repo.vfs(b'localtags', b'a') |
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645 else: |
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646 prevtags = fp.read() |
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647 |
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648 # local tags are stored in the current charset |
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649 writetags(fp, names, None, prevtags) |
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650 for name in names: |
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651 repo.hook(b'tag', node=hex(node), tag=name, local=local) |
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652 return |
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653 |
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654 try: |
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655 fp = repo.wvfs(b'.hgtags', b'rb+') |
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656 except IOError as e: |
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657 if e.errno != errno.ENOENT: |
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658 raise |
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659 fp = repo.wvfs(b'.hgtags', b'ab') |
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660 else: |
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661 prevtags = fp.read() |
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662 |
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663 # committed tags are stored in UTF-8 |
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664 writetags(fp, names, encoding.fromlocal, prevtags) |
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665 |
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666 fp.close() |
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667 |
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668 repo.invalidatecaches() |
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669 |
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670 if b'.hgtags' not in repo.dirstate: |
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671 repo[None].add([b'.hgtags']) |
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672 |
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673 m = matchmod.exact([b'.hgtags']) |
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674 tagnode = repo.commit( |
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675 message, user, date, extra=extra, match=m, editor=editor |
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676 ) |
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677 |
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678 for name in names: |
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679 repo.hook(b'tag', node=hex(node), tag=name, local=local) |
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680 |
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681 return tagnode |
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682 |
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683 |
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684 _fnodescachefile = b'hgtagsfnodes1' |
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685 _fnodesrecsize = 4 + 20 # changeset fragment + filenode |
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686 _fnodesmissingrec = b'\xff' * 24 |
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687 |
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688 |
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689 class hgtagsfnodescache(object): |
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690 """Persistent cache mapping revisions to .hgtags filenodes. |
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691 |
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692 The cache is an array of records. Each item in the array corresponds to |
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693 a changelog revision. Values in the array contain the first 4 bytes of |
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694 the node hash and the 20 bytes .hgtags filenode for that revision. |
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695 |
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696 The first 4 bytes are present as a form of verification. Repository |
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697 stripping and rewriting may change the node at a numeric revision in the |
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698 changelog. The changeset fragment serves as a verifier to detect |
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699 rewriting. This logic is shared with the rev branch cache (see |
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700 branchmap.py). |
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701 |
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702 The instance holds in memory the full cache content but entries are |
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703 only parsed on read. |
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704 |
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705 Instances behave like lists. ``c[i]`` works where i is a rev or |
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706 changeset node. Missing indexes are populated automatically on access. |
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707 """ |
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708 |
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709 def __init__(self, repo): |
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710 assert repo.filtername is None |
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711 |
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712 self._repo = repo |
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713 |
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714 # Only for reporting purposes. |
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715 self.lookupcount = 0 |
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716 self.hitcount = 0 |
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717 |
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718 try: |
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719 data = repo.cachevfs.read(_fnodescachefile) |
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720 except (OSError, IOError): |
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721 data = b"" |
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722 self._raw = bytearray(data) |
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723 |
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724 # The end state of self._raw is an array that is of the exact length |
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725 # required to hold a record for every revision in the repository. |
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726 # We truncate or extend the array as necessary. self._dirtyoffset is |
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727 # defined to be the start offset at which we need to write the output |
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728 # file. This offset is also adjusted when new entries are calculated |
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729 # for array members. |
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730 cllen = len(repo.changelog) |
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731 wantedlen = cllen * _fnodesrecsize |
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732 rawlen = len(self._raw) |
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733 |
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734 self._dirtyoffset = None |
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735 |
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736 rawlentokeep = min( |
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737 wantedlen, (rawlen // _fnodesrecsize) * _fnodesrecsize |
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738 ) |
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739 if rawlen > rawlentokeep: |
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740 # There's no easy way to truncate array instances. This seems |
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741 # slightly less evil than copying a potentially large array slice. |
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742 for i in range(rawlen - rawlentokeep): |
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743 self._raw.pop() |
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744 rawlen = len(self._raw) |
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745 self._dirtyoffset = rawlen |
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746 if rawlen < wantedlen: |
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747 if self._dirtyoffset is None: |
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748 self._dirtyoffset = rawlen |
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749 # TODO: zero fill entire record, because it's invalid not missing? |
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750 self._raw.extend(b'\xff' * (wantedlen - rawlen)) |
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751 |
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752 def getfnode(self, node, computemissing=True): |
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753 """Obtain the filenode of the .hgtags file at a specified revision. |
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754 |
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755 If the value is in the cache, the entry will be validated and returned. |
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756 Otherwise, the filenode will be computed and returned unless |
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757 "computemissing" is False. In that case, None will be returned if |
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758 the entry is missing or False if the entry is invalid without |
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759 any potentially expensive computation being performed. |
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760 |
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761 If an .hgtags does not exist at the specified revision, nullid is |
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762 returned. |
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763 """ |
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764 if node == self._repo.nullid: |
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765 return node |
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766 |
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767 ctx = self._repo[node] |
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768 rev = ctx.rev() |
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769 |
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770 self.lookupcount += 1 |
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771 |
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772 offset = rev * _fnodesrecsize |
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773 record = b'%s' % self._raw[offset : offset + _fnodesrecsize] |
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774 properprefix = node[0:4] |
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775 |
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776 # Validate and return existing entry. |
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777 if record != _fnodesmissingrec and len(record) == _fnodesrecsize: |
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778 fileprefix = record[0:4] |
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|
779 |
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|
780 if fileprefix == properprefix: |
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781 self.hitcount += 1 |
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|
782 return record[4:] |
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|
783 |
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|
784 # Fall through. |
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|
785 |
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|
786 # If we get here, the entry is either missing or invalid. |
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|
787 |
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|
788 if not computemissing: |
46495
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|
789 if record != _fnodesmissingrec: |
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|
790 return False |
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|
791 return None |
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diff
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|
792 |
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hgtagsfnodes: refactor code to compute fnode into separate fn
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|
793 fnode = self._computefnode(node) |
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794 self._writeentry(offset, properprefix, fnode) |
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|
795 return fnode |
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|
796 |
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|
797 def _computefnode(self, node): |
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798 """Finds the tag filenode for a node which is missing or invalid |
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|
799 in cache""" |
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|
800 ctx = self._repo[node] |
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|
801 rev = ctx.rev() |
42237
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|
802 fnode = None |
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|
803 cl = self._repo.changelog |
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|
804 p1rev, p2rev = cl._uncheckedparentrevs(rev) |
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|
805 p1node = cl.node(p1rev) |
9f45d3d526f9
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806 p1fnode = self.getfnode(p1node, computemissing=False) |
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|
807 if p2rev != nullrev: |
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|
808 # There is some no-merge changeset where p1 is null and p2 is set |
9f45d3d526f9
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|
809 # Processing them as merge is just slower, but still gives a good |
9f45d3d526f9
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|
810 # result. |
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|
811 p2node = cl.node(p1rev) |
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|
812 p2fnode = self.getfnode(p2node, computemissing=False) |
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|
813 if p1fnode != p2fnode: |
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|
814 # we cannot rely on readfast because we don't know against what |
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|
815 # parent the readfast delta is computed |
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|
816 p1fnode = None |
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|
817 if p1fnode: |
42237
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|
818 mctx = ctx.manifestctx() |
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|
819 fnode = mctx.readfast().get(b'.hgtags') |
42237
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|
820 if fnode is None: |
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|
821 fnode = p1fnode |
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|
822 if fnode is None: |
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|
823 # Populate missing entry. |
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|
824 try: |
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|
825 fnode = ctx.filenode(b'.hgtags') |
42237
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|
826 except error.LookupError: |
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|
827 # No .hgtags file on this revision. |
47012
d55b71393907
node: replace nullid and friends with nodeconstants class
Joerg Sonnenberger <joerg@bec.de>
parents:
46819
diff
changeset
|
828 fnode = self._repo.nullid |
25381
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diff
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|
829 return fnode |
47edeff19139
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changeset
|
830 |
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|
831 def setfnode(self, node, fnode): |
47edeff19139
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|
832 """Set the .hgtags filenode for a given changeset.""" |
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|
833 assert len(fnode) == 20 |
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|
834 ctx = self._repo[node] |
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diff
changeset
|
835 |
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changeset
|
836 # Do a lookup first to avoid writing if nothing has changed. |
47edeff19139
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diff
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|
837 if self.getfnode(ctx.node(), computemissing=False) == fnode: |
47edeff19139
tags: support setting hgtags fnodes cache entries
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parents:
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diff
changeset
|
838 return |
47edeff19139
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parents:
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diff
changeset
|
839 |
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|
840 self._writeentry(ctx.rev() * _fnodesrecsize, node[0:4], fnode) |
47edeff19139
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parents:
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diff
changeset
|
841 |
46656
9a31f65381ae
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Pulkit Goyal <7895pulkit@gmail.com>
parents:
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diff
changeset
|
842 def refresh_invalid_nodes(self, nodes): |
9a31f65381ae
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parents:
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changeset
|
843 """recomputes file nodes for a given set of nodes which has unknown |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
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diff
changeset
|
844 filenodes for them in the cache |
9a31f65381ae
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Pulkit Goyal <7895pulkit@gmail.com>
parents:
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diff
changeset
|
845 Also updates the in-memory cache with the correct filenode. |
9a31f65381ae
tags: validate nodes in _getfnodes() and update cache in case of unknown nodes
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diff
changeset
|
846 Caller needs to take care about calling `.write()` so that updates are |
9a31f65381ae
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parents:
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diff
changeset
|
847 persisted. |
9a31f65381ae
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diff
changeset
|
848 Returns a map {node: recomputed fnode} |
9a31f65381ae
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changeset
|
849 """ |
9a31f65381ae
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changeset
|
850 fixed_nodemap = {} |
9a31f65381ae
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diff
changeset
|
851 for node in nodes: |
9a31f65381ae
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diff
changeset
|
852 fnode = self._computefnode(node) |
9a31f65381ae
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diff
changeset
|
853 fixed_nodemap[node] = fnode |
9a31f65381ae
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diff
changeset
|
854 self.setfnode(node, fnode) |
9a31f65381ae
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diff
changeset
|
855 return fixed_nodemap |
9a31f65381ae
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diff
changeset
|
856 |
25381
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changeset
|
857 def _writeentry(self, offset, prefix, fnode): |
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changeset
|
858 # Slices on array instances only accept other array. |
31346
2a18e9e6ca43
py3: use bytearray() instead of array('c', ...) constructions
Augie Fackler <augie@google.com>
parents:
31025
diff
changeset
|
859 entry = bytearray(prefix + fnode) |
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changeset
|
860 self._raw[offset : offset + _fnodesrecsize] = entry |
24735
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diff
changeset
|
861 # self._dirtyoffset could be None. |
36277
18106c3bc94a
tags: don't feed both int and None to min()
Augie Fackler <augie@google.com>
parents:
35828
diff
changeset
|
862 self._dirtyoffset = min(self._dirtyoffset or 0, offset or 0) |
24735
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diff
changeset
|
863 |
07200e3332a1
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changeset
|
864 def write(self): |
07200e3332a1
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diff
changeset
|
865 """Perform all necessary writes to cache file. |
07200e3332a1
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parents:
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diff
changeset
|
866 |
07200e3332a1
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parents:
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diff
changeset
|
867 This may no-op if no writes are needed or if a write lock could |
07200e3332a1
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parents:
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diff
changeset
|
868 not be obtained. |
07200e3332a1
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parents:
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diff
changeset
|
869 """ |
07200e3332a1
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changeset
|
870 if self._dirtyoffset is None: |
07200e3332a1
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parents:
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diff
changeset
|
871 return |
07200e3332a1
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parents:
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diff
changeset
|
872 |
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changeset
|
873 data = self._raw[self._dirtyoffset :] |
24735
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diff
changeset
|
874 if not data: |
07200e3332a1
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parents:
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diff
changeset
|
875 return |
07200e3332a1
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diff
changeset
|
876 |
07200e3332a1
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changeset
|
877 repo = self._repo |
07200e3332a1
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parents:
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diff
changeset
|
878 |
07200e3332a1
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parents:
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diff
changeset
|
879 try: |
45435
64de86fd0984
tags: take lock instead of wlock before writing hgtagsfnodes1 cache
Pulkit Goyal <7895pulkit@gmail.com>
parents:
44351
diff
changeset
|
880 lock = repo.lock(wait=False) |
24806
61aea11fb83d
tags: do not abort if failed to write lock file to save cache
Yuya Nishihara <yuya@tcha.org>
parents:
24763
diff
changeset
|
881 except error.LockError: |
43076
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changeset
|
882 repo.ui.log( |
43077
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diff
changeset
|
883 b'tagscache', |
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parents:
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diff
changeset
|
884 b'not writing .hg/cache/%s because ' |
687b865b95ad
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parents:
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diff
changeset
|
885 b'lock cannot be acquired\n' % _fnodescachefile, |
43076
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886 ) |
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887 return |
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888 |
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889 try: |
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890 f = repo.cachevfs.open(_fnodescachefile, b'ab') |
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891 try: |
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892 # if the file has been truncated |
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893 actualoffset = f.tell() |
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894 if actualoffset < self._dirtyoffset: |
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895 self._dirtyoffset = actualoffset |
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896 data = self._raw[self._dirtyoffset :] |
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897 f.seek(self._dirtyoffset) |
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898 f.truncate() |
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899 repo.ui.log( |
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900 b'tagscache', |
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901 b'writing %d bytes to cache/%s\n' |
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902 % (len(data), _fnodescachefile), |
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903 ) |
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904 f.write(data) |
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905 self._dirtyoffset = None |
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906 finally: |
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907 f.close() |
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908 except (IOError, OSError) as inst: |
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909 repo.ui.log( |
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910 b'tagscache', |
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911 b"couldn't write cache/%s: %s\n" |
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912 % (_fnodescachefile, stringutil.forcebytestr(inst)), |
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913 ) |
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914 finally: |
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915 lock.release() |